Full-stroke mechanism for calculating-machines, &amp;c.



W. W. HOPKINS. FULL STROKE MECHANISM FOR CALCULATING MACHINES, 6m. APPLIUATIOH FILED JUNE 21, 1909.

977,190 Patented Nov. 29, 1910.

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WILLIAM W. HOPKINS. OF ST. LOUIS, MISSOURI. ASSIGNOR T MACHINE COMPANY, OF ST. LOUIS. MISSOURI. A CORPORATION OF MISSOURI.

FULL-STROKE MECI-IANISTM FOR CALCULATfNGJVIACHINESv 8w.

Specification of Letters Batent.

Patented Nov. 29, 1910.

Original application fileu April 9,4909, Serial No. 488.883. .Divided and this application filed June 21, 1909. Serial No 503.394.

To all 11.7mm it may concern:

Be it known. that 1. Woman 11'. Honiuxs, a citizen of the United States, residing at St. Louis. Missouri. have invented a certain new and useful lmprov'ementin Full- ..Stroke Mechanism 'for Calculating-Machines, &c., of which the following is a full, clear, and exact description, such as will enable others skilled in the art to which it appertains to make and use the same, reference beinp had to the accompanying: drawings, forming part of this specification, in whieh-- Figure l is a-top plan view illustrating portions of key bars of a calculating machine to which my improved full stroke mechanism has been applied. Fig. 2 is a side elevational view of the full stroke mechanism. Fig. 3 is a similar view showing the parts in a changed position.

his invention relates to a new and u; e tul improvement in full stroke mechanism for use in connection with the key bars of calculating machines, cash registers, and the like, or for compelling a fullstroke of the operating handle employed in connection with such devices.

The object of my present invention is to compel the controlled part, such as the key bar handle, or the like, to be given a. full stroke. If the controlled part. is given a partial stroke and released. it will be locked in its midway position. 'alling the operators attention to the fact that further movement is required, which further movement when given will release the controlled part and permit its restoration to normal position.

This present invention is a division of an application filed by me April 9th, 1905), Serial No. 488,883.

In the drawings, 19 indicates the part to be controlled, in this instance, the key bars of a calculating machine, which key bars are pivoted at 20 to an appropriate base. i

50 are the side pieces of a frame pivotally mounted on a shaft 49, and carrying a bar 51 arranged above the key bars 1!.) or other part to be controlled, which key bars 19 will raise the bar 51, when any of them is operated, and coincidentally raise the side frame pieces 50. One of the side pieces or arms 50, which may he termed an cscapement fork or lever, is provided with an overhang 122 on which is pivotally mounted a hooked pawl 1:23. constituting an impulse ratchet, t'or eoi'vperating with the ratchet wheel 121. A. spring 12%- holds the pawl in engagement with its ratchet wheel. Teeth are formed on the underside of the overhang tor cooperating with the teeth-of wheel 120. spring-pressed notched. restraining pawl p MOON-HOEKINS BILLING 12(3. mounted on the base plate 1. also cooperates with the teeth of wheel 120.

127 is a hooked extension constituting a stop pallet. on arm 50"which cooperates with the teeth of wheel 120 opposite the impulse pawl 123.

The operation of this full stroke mechanism is as follows: The normal position of the parts is shown in Fin. 2. Vhen a key is depressed. the bar 51 is raised and the arm 50 is lifted. with the result that'the pawl 123 rotates the ratchet wheels 120-121. The tooth of wheel 121. lying immediately above the stop pallet 127. will pass therebelow; the tooth' which lies under the teeth 125. and the tooth at the bottom of the-series of notches in pawl 126. .will ride over said notches in its upward travel. until, as shown in Fig. 3. the tooth above the one first mentioned will engage in the stop pallet, 127. thus arresting the downward movement of the digit key and insuring an eve-{1 stroke with respectto all of the keys: th} second mentioned tooth will have passed ii. er the teeth 125, and the last mentioned tooth. will lie above the pawl 126. The drag of pawl 123 cannot. therefore, reversely rotate the wheels 12(l121. and disavrange the relation of the teeth thereof to the other parts with which they cooperate. Should the key be released before a full stroke is made, the teeth 125 will enrrage the tooth of wheel 121 in operative relation thereto. and prevent the disarrangement of the relation between the pawl 123 and the tooth of whe l .120 with which it is in engagement, and the notches in pawl 126 will prevent backward rotation of wheel 121, hence the key will be locked mid-stroke. and it is necessary to complete the stroke before the star-wheel and its asso ciate parts will be placed in position to permit the key to rise.

I am aware that minor changes in the con-.

struction, arrangement and combination of the "eral parts of my device can be made and substituted for those herein shown and described, without in the least departing firm)": the nature and principle of my inven- I claim:

1. In a device of the character described, the combination of the controlled part and means for compelling a full stroke thereof, zid means comprising a rotatable star wheel and an escapem'ent fork or lever coiiperating therewith.

2. In a device of the character described,

the combination of the controlled part and means for compelling a full stroke thereof, said means comprising an escapement wheel and a fork or lever which is operated by said controlled part and which is provided with,

an impulse pallet and a stop pallet.

3. In a device ofthe character described,

the combination of the controlled partand means for compelling a full stroke thereof,

said means comprising a'star wheel and a conjoined ratchet, an escapement fork operated by said controlled part, said fork having an impulse pallet coiiperatin' 'with' theconjoined ratchet and a stop pal ct cooperating: with said star wheeh'and means on said fork to prevent the impulse pallet from engaging another tooth before the completion of a stroke.

4. In a device of the character described,

the combinationof the controlled part and means for compelling a full stroke thereof, said means comprising a star Wheel and a conjoined ratchet, an e'scapement fork operated by said controlled part, said fork having an impulse pallet coiipereting with the conjoined ratchet and a stop pellet cooperatmg with said star wheel, and means on said fork to prevent the impulse pallet coiiperating with said star wheel.

ermoo conjoined ratchet, an escapement fork operated by said controlled part, said fork having-an impulse pallet cooperating with the conjoined ratchet and a stop pallet 006p crating with said star wheel, means on said fork to prevent the impulse pallet from engaging another tooth before the completion of a stroke, and a notched restraining pawl Y 6. In a device of the character described, the combination of the controlled part and means for compelling a full stroke thereof, said means comprising a star wheel and -a conjoined ratchet, an escapement fork operated by saidv controlled part, said fork' having animpulse pallet coiiperating with the conjoined ratchet and a stop pallet cooperating with said star wheel, meanson said fork to preventthe impulse pallet from engaging another tooth before the completion of a stroke, said means also preventing retrograde movement of said star Wheel, and a notched restraining pawl cooperating with said star wheel.

In testimony whereof I hereunto atlix my signature in the presence of twowitnesses,

this 19th day of June 1909.

f VVILLTAM 'W. HOPKINS. Witnesses:

M. P. SMITH,

Lenore CLARK. 

